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2013 | 09 | 1 |
Tytuł artykułu

Effect of post partum uterine involution on folliculogenesis, oestrus and conception in cows

Treść / Zawartość
Warianty tytułu
PL
Wpływ poporodowej inwolucji macicy na folikulogenezę, ruję i zapłodnienie krów
Języki publikacji
EN
Abstrakty
EN
The ending of the puerperium has place when the first oestrus postpartum gestation is restored. To that end the anatomical and histological uterine involution must be completed and the hypothalamic-pituitary-gonadal axis must work properly to allow: oestrus, ovulation, conception, implantation, formation and persistence of corpus luteum of pregnancy. Therefore, early postpartum disorders such as NEB, abnormal gonadotropin secretion, uterine infection and other disorders could have subsequent deleterious effects on oocyte development and competence. However, low BCS coupled with severe NEB during this period suppresses pulsatile LH secretion, reduces ovarian responsiveness to LH stimulation and also reduces the functional competence of the follicle characterized by reduced oestradiol production and ultimately results in delayed ovulation. Normal oestrous cycles in cows coupled with overt signs of oestrus are essential so that insemination can occur at the appropriate time relative to ovulation. Also good nutrition management, environment conditions and welfare can support normal uterine postpartum involution and recurrence of cyclicity.
PL
Okres poporodowy kończy się w momencie wystąpienia pierwszej rui po porodzie. Wcześniej musi się zakończyć anatomiczna i histologiczna inwolucja macicy, a także prawidłowo funkcjonować oś podwzgórzowo-przysadkowo-gonadowa, aby umożliwić ruję, owulację, zapłodnienie, implantację, powstanie i utrzymanie ciążowego ciałka żółtego. Wczesne zaburzenia poporodowe, takie jak ujemny bilans energetyczny (NEB – negative energy balance), anormalna sekrecja gonadotropin, zakażenie macicy i inne zaburzenia mogą mieć szkodliwy wpływ na rozwój i wydolność oocytów. Niska punktowa ocena kondycji krowy (BCS – body condition score) w połączeniu z drastycznym NEB w okresie poporodowym tłumi pulsacyjną sekrecję hormonu luteinizującego (LH – luteinizing hormone), obniża zdolność reakcji jajników na stymulację LH, a także zmniejsza wydolność funkcjonalną pęcherzyków, co charakteryzuje się obniżoną produkcją estradiolu, i wreszcie, powoduje opóźnioną owulację. Normalne cykle rujowe u krów oraz jawne oznaki rui to zasadnicze warunki, aby inseminacja mogła nastąpić we właściwym czasie w stosunku do owulacji. Także dobry system żywienia, prawidłowe warunki środowiskowe i dobrostan zwierząt mogą być czynnikami wspomagającymi normalną poporodową inwolucję macicy i powrót cykliczności rui.
Słowa kluczowe
EN
Wydawca
-
Rocznik
Tom
09
Numer
1
Opis fizyczny
p.57-65,fig.,ref.
Twórcy
autor
  • Clinic for Ruminants, University of Veterinary Medicine and Pharmacy, Komenskeho 73, 041 81 Kosice, Slovakia
autor
  • Clinic for Ruminants, University of Veterinary Medicine and Pharmacy, Komenskeho 73, 041 81 Kosice, Slovakia
autor
  • Clinic for Ruminants, University of Veterinary Medicine and Pharmacy, Komenskeho 73, 041 81 Kosice, Slovakia
autor
  • Clinic for Ruminants, University of Veterinary Medicine and Pharmacy, Komenskeho 73, 041 81 Kosice, Slovakia
autor
  • Clinic for Ruminants, University of Veterinary Medicine and Pharmacy, Komenskeho 73, 041 81 Kosice, Slovakia
autor
  • Clinic for Ruminants, University of Veterinary Medicine and Pharmacy, Komenskeho 73, 041 81 Kosice, Slovakia
Bibliografia
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Uwagi
PL
Rekord w opracowaniu.
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
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